Safety car device



c. c, FARMER.

SAFETY CAR DEVICE" APPLlcATmN. FILED MAR.26,1920.

Patented May 17, i921.

GUlCff REI- Avn PowER xNVENToR cLYDE C. FARMER ATTORNEY UNITED stai-'ss GLYDE c. FARMER, 0E EneEwooii, PENNSYLVANIA, Assrcnon rro Arnr-rrie g 'rnEjwEsTIive- HOUSE AIR BRAKE COMPANY, 0F WILMERDING, PENNSYLVANIA, A CQRPORA..

TION 0F PENNSYLVANIA.

SAFETY CAE DEVICE. i 1

specification of Letters Patent. PatentedMay 17', 1921 Application filed March 26, 1920. Serial No. 368,909.

vfication.

This invention relates to car brake and power controlling devices adapted more par-A ticularly for electric ,traction cars. n

` It sometimes happens that power will fail by the trolley wheel leaving the trolley wire while the car is running. In order to stop the car so as to replace the trolley wheel on the trolley wire, the motorman will apply the brakes, but he may neglect to return the controller handle to off position before leavin the car.

en the motorma'n'replaces the trolley wheel on the trolley wire, current will be supplied to the car motors, since the controller has been left in a power position,

' and if the power of the motors'. should eX- ceed the holdingpower of the brakes the car will start off without the motorman.

The principal object of my invention is to provide means for overcoming the above difficulty. l y

In the accompanying drawing; Figure 1 is a diagrammatic viewv of a car brake andV power controlling apparatus embodying my invention; Fig. 2 a diagrammatic view illustrating an applicationY of certain features of my invention where van automatic controller of the H. L. type is employed.

'In Fig. 1 of the drawing, the reference numeral 1 indicates a brake valve device having a valve for controlling ports for ap# plying and releasing the brakes in the u sual manner ands'aid brake valve is provided, with connected contacts 2 adapted in one position of the,` brake valve to complete a circuit through fingers 3 and.4.

^ A development'ofa portion of the usual Y hand operated controller isA shown in which.

an additional contact bar 5 A is provided,l which inthe ofi" positionof the controller is adapted to closel a circuit through wires 6' and 7. Y f The power circuit to the controller is controlledby a switch device, comprising connectedcontacts 8, carriedby pistonstem 9 of a piston 11, andadapted toconnect contact fingers 12 for completing a circuit from the trolley-15through wire 10, to power contact 1,3 of the controller. A .Y

The'piston 11 is moved in one direction by a spring 17 and inthe opposite direction by liuid'underpressure supplied to the piston chamber, 18. q

yThe admission and release of Huidy underv pressure` to and from thepiston chamber 18 is controlled by a double beat valve 23, Y adapted in one positionto supply fluid vfrom a reservoir 24 to said piston chamber and in the opposite position to connect said chamber with an exhaust port 25.` f i The double beat valve 23 is controlled by a magnet 14, having one circuit connected through wire 7 with a contact in the con-Y troller and another circuit through a switch Y 26 `and a wire 19 v4connectedto contact linger..

4` at the brakevalve. Y p

The brake valvedevice may havethe positions of lquickV release, f slow release, lap, service, and emergency application, .and preferably, the contacts 2 are arranged to close the circuit through the fingers 3 and 4 in the quick release position of the brake valve. f o In operation, lif the brake valve isinits quick release position andthe powerycon'- troller inits ofi position, the magnet 14 will be energized through the circuit controlled by the contact bar 5 in thecontrollerandl the switch 26 will be moved to itsclos'ed position by the magnet 14.l

The double beat valve 23 is also ,movedl to the position shown in the drawing, 'in which fluid under pressure is supplied from the reservoir 24 to the piston chamber 18 so thatrpiston 11 operates the contacts 8to close thef circuit through contact fingers j12." Currentv` is then supplied to` the controller through wire 10 to the power contact V1 so that the controller may be operated tosu'p-V ply current to the car motors in the usual'` If the trolley wheel should leave the trolley wire, the magnet 14 will at once be denergized andthe doublebeat valve 23 will be. shifted'by spring 27 to itsupper position, in which lfluid under pressure is vented from piston chamber 18, permitting the spring 17 to shift the piston and the contacts 8, so as to open the power circuit at the.

. contact lingers 12.

. If the trolley wheel is now replaced on .the trolley wire, no current will Vbe supplied l and 4:.

Vso

It will be noted that since lthe circuit of.

the magnet 14 is completed through contacts controlled by the brake valve, lany movement oi-the brake valve from the power position willeiect the opening of the power circuit.

In order thatpower vmay be available, in case-of necessity,V when the brake valve is movedY to lanother position, as for example.

when power is required Vfor `operating track.

switches, andthe brakes are` to be applied,

i a local circuit may be provided around .the

brake valve contacts which Amay be manuallyheldclosed byv a switch 20.-' Said switch is normally-held open by a spring 21 and is adapted to lloe-closed by pressing a push button 22;

With a controller of the automatic type,

*such` as `thel H. L. controller, where the clos-Y ing of the power circuit causes the controller to operate automaticallyl to supply current to the car motors fand-.the openingof the.

power circuit causes .the controller. parts to return to ofi position, .thefclrcuit connectionsufrom the rmagnet 14 to contactsin the.

controller are not employed, the arrangement of the switches, however, beingv ysubstantiallythe same, asshown in-.Fig 2 of.

. the drawing.

In this case,fwhe'n power is lostr by the trolley leavingthcrtrolley' wire, the magnet 14-will be denergized Soas to effect the openingei` the switchv8 and the trolley circuit.to' the controller v30, as described in connection .with the apparatus .shown vin Fig. 1.

When the operator replaces the trolley .Y wheel, the magnet 14 will not Vbeener-gized to yetfecttheV closure of the switch 8, since. the Lmagnet circuit is open atthc switch 26. When the. operator.; returnsv to thecar, vhe must -press.thebutton225'so as to close an auxiliary circuit ytothe magnet 14. When the magnet 14 is energized, the switch26 will be closed and the operator may then release the button 22, since the magnet circuitr will now be maintained through the contacts controlled by the brake `valve 1, so long as the brake valve is maintained the power on position; 'Y

Having `now described my invention, what f I claim as v.new and desire to secure by Letters Patent, is:

1. Ina c ar brake and'pow'er controlling apparatusLthe combination with a Vpower controller, of a switch'device for controlling the power circuit of the controller, 'elec-i trically controlled means/for controlling'y the operation of said switch, and a brake valve device for controlling the circuit of said-v meall'ls.:

Y Y 2; In acar brake and power controllingI apparatus,the,V combination withY a power' controller, ofa switch devicejfor controlling the power circuit of the controller, a magnet device, adapted upon denergization to' eife'ct the openingof said switch, and: 'a brake i valve device having a position for closing thecircuit of said magnet. Y

3.'In a car brake and power controlling apparatus, the combination with a power. controller of a switch device for controlling.

the power 'circuit of the controller, La, magnet device adapted upon denergizationty'effgf-,A the opening of said switch,'a brake valve deg,

vice having aposition for closing. the-.cir-

cuit of said magnet, and a switchcontrolled. by said magnet for alsocontrollingthe mag;

net circuit.

4. Ina carbrake and .powercontrollingf apparatus,.fthe combination .with a. power. i controller, of a switchdevice foi-controlling.

the power circuitof said .controller,..a magnet device. for colitrollingthe operationi 'I said switch device, a brake valve devicfeforfv controlling the circuit of said magnet? device,

and. means for closingthecircuit. ofsaid.l

magnet device in. the ,off .positionof the. controller.

5. Ina car brake andpower controlling` apparatus, the combination .vv/ith.; a power controller, of magnet controlled imeansfo'r controlling the power. circuitofsaidf 'controller and means for closing-the Vcirc11it` .of.

the `magnetin the `otl`,positon of th'eQconf;` troller.y 1

6. ,In a car,brakefandfpower:controlling apparatus, the .combination with a `power. controller, of magnet controlled {meansgfor controlling the` power Y.circuit-0f saidncon-` troller, a brakevalvfe device, forcontrolling l,

troller to` oi position... w

7. Ina carbrakeand. power controlling.

apparatus, the combination with a power controller, of .a switch ydevice .for .controlling the power: circuit of the co.ntroller,.1a magnet. adapted upon energization. for effecting the closure of said switch, a brake valve dethe. circuit of thefmagnet, `saidcircuit-beep' ing alsoclosed bythe .movement .oi- 4the. con-.`

vice for controlling the circuit of said magnet, and means for closing the magnet circuit in the off position of the controller.

8. In a car brake and power controlling apparatus, the combination with a power controller, of a switch device for controlling the power circuit of the controller, a magnet adapted upon energization for effecting the closure of said switch, a brake valve device having contacts for controlling a circuit o the magnet, a switch operated upon energization of said magnet for closing said circuit, and means controlled by the movement of said controller to off position, for closing a circuit through said magnet.

9. In a car brake and power controlling apparatus, the combination with a power controller, of a switch device for controlling the power circuit of the controller, a magnet adapted upon energization for effecting the closure of said switch, a brake valve device having contacts for controlling a circuit through said magnet and a'normally open switch adapted to be manually operated for closing-the magnet circuit independently ofk the position of the brake valve device.

In testimony whereofI have hereunto set my hand.

CLYDE C. FARMER. 

